An electrical connector includes a shell having a mating end and a termination end. The shell has a securing feature configured to secure the shell to a mating connector. The shell has a cavity that extends between the mating end and the termination end. A terminal subassembly includes a dielectric insert that is configured to be held within the cavity of the shell. The dielectric insert is configured to hold terminals such that mating interfaces of the terminals are configured to mate with corresponding terminals of the mating connector and such that termination interfaces of the terminals are configured to be terminated to a cable. The dielectric insert is a modular insert that is configured to hold the terminals when the termination interfaces are flat interfaces and is also configured to hold the terminals when the termination interfaces are crimp interfaces.